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Partners' Capital and Distributions - Units Outstanding (Details) - shares	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021
Series A Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	71,090,468	71,090,468	71,090,468	71,090,468	71,090,468
Outstanding, end of period (units)	71,090,468	71,090,468	71,090,468	71,090,468	71,090,468
Series B Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	800,000	800,000	800,000	800,000	800,000
Outstanding, end of period (units)	800,000	800,000	800,000	800,000	800,000
Common Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	722,055,847	722,380,416	728,053,007	728,028,576	722,380,416
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units)	(4,940,592)	(350,000)
Issuances of common units under equity-indexed compensation plans (units)	256,321	25,431	47,391	24,431
Outstanding, end of period (units)	717,371,576	722,055,847	728,100,398	728,053,007	717,371,576

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The number of limited partner units outstanding.

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- Definition

Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners.

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Number of shares that have been repurchased and retired during the period.

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